Finding the Fourth Proportional to 1,071.72, 1,479.06 and 896.76

Step by Step Solution

1. Step 1: Write the proportion equation
   1,071.72 : 1,479.06 = 896.76 : x
2. Step 2: Convert to fraction form
   1,071.72/1,479.06 = 896.76/x
3. Step 3: Cross multiply
   1,071.72x = 1,479.06 × 896.76
4. Step 4: Simplify right side
   1,071.72x = 1,326,361.85
5. Step 5: Solve for x
   x = 1,326,361.85/1,071.72
6. Step 6: Final answer
   x = 1,237.60